What is your Haunts hitting for?
My Carnevil poison darts are doing from 30-100+ mil per shot, depending on what buffs are active. Trying to compare that to haunt which I think would need to be pumping out close to a billion damage per haunt to even compare.

The only way to maximize the fetishes for damage is to get them to shoot darts, otherwise up to 50% of them just stand there.